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Rashid [163]
3 years ago
14

Determine the volume, in liters, occupied by 0.015 molecules of oxygen at STp?

Chemistry
1 answer:
Arlecino [84]3 years ago
5 0

5.58 X 10^{-25} Litres is the volume, in liters, occupied by 0.015 molecules of oxygen at STP.

Explanation:

Data given:

molecules of oxygen = 0.015

number of moles of oxygen =?

temperature at STP = 273  K

Pressure at STP = 1 atm

volume = ?

R (gas constant) = 0.08201 L atm/mole K

to convert molecules to moles,

number of moles = \frac{molecules}{Avagadro's number}

number of moles = 2.49 x 10^{-26}

Applying the ideal gas law since the oxygen is at STP,

PV = nRT

rearranging the equation:

V = \frac{nRT}{P}

putting the values in the rearranged equation:

V = \frac{2.49 X10^{-26}   X 0.08201 X 273}{1}

V = 5.58 X 10^{-25} Litres.

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1s^{2} 2s^{2} 2p^{4}

Explanation:

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3 years ago
Calculate the amount of heat needed to boil of benzene (), beginning from a temperature of . Be sure your answer has a unit symb
Pavlova-9 [17]

Answer:

Check explanation

Explanation:

From the question, the parameters given are 64.7g of benzene,C6H6; a starting temperature of 41.9°C and bringing it to 33.2°C.

Molar mass of benzene,C6H6= 78.11236 g/mol.

Things to know: heat capacity of benzene, C6H6= 1.63 J/g.K, the heat of fusion = 9.87 kj/mol.

STEP ONE(1): ENERGY USED IN MELTING BENZENE SOLID.

Using the formula below;

Energy used in melting the solid(in JOULES) = (mass of benzene/molar mass of benzene) × heat of Fusion.

=(64.7 g of C6H6/ 78.11236(g per mol) of C6H6) × 9.87 kJ per mol.

= 8.175 J.

= 0.008175 kJ.

STEP TWO (2): ENERGY OF HEATING THE LIQUID.

It can be calculated from the formula below;

Energy= heat capacity (J/g.K) × mass of benzene× (∆T).

= 1.63 J/g.K × 64.7 × (41.9-33.2).

= 917.5J.

= 0.9175 kJ.

Energy required to boil benzene= Energy required to melt the bezene + energy required for boiling.

= 0.008175+ 0.9175.

= 0.93kJ

Approximately, 1 kJ

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T or F: Lone pairs around the oxygen atom of a water molecule play no role in determining its molecular geometry?
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Answer:

Explanation:

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Use for questions 1-4
Y_Kistochka [10]

Answer: 1) 1.6 moles of HCl

2) 7.0 moles of HCl

3) 2.4 moles of hydrogen

4) 0.96 moles of HCl

Explanation:

The balanced chemical equation is:

Zn+2HCl\rightarrow ZnCl_2+H_2  

According to stoichiometry :

1 mole of Zn require = 2 moles of HCl

0.8 moles of Zn will require=\frac{2}{1}\times 0.8=1.6moles  of HCl

3.5 moles of Zn will require=\frac{2}{1}\times 3.5=7.0moles  of HCl

According to stoichiometry :

2 moles of HCl produce = 1 mole of H_2

4.8 moles of HCl will require=\frac{1}{2}\times 4.8=2.4moles  of H_2

According to stoichiometry :

1 mole of ZnCl_2 are produced by = 2 moles of HCl

0.48 moles of ZnCl_2 are produced by =\frac{2}{1}\times 0.48=0.96moles  of HCl

6 0
2 years ago
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